- 1998 - 現在 日本語研究の歴史
- 1993 - 現在 日本語文法史
- 1993 - 現在 日本語文法の理論
- 2022 - 2025 日本語叙述類型研究
- 2019 - 2023 小林好日による東北方言通信調査資料の整備と分析
- 2019 - 2023 言語変化の要因についての基礎的研究
- 2014 - 2017 Fundamental research on methods of narration for the history of the Japanese language
- 2012 - 2015 Multifaceted Investigation with a Focus on Yamada Yoshio in the Establishment Period of the Modern Japanese Linguistics
- 2009 - 2011 Research on the Establishment of Japanese Linguistics as a Discipline in the Early Twentieth Century viewed through the Contributions of Yoshio Yamada and Yoshiharu Kobayashi
- 2007 - 2009 A Functional and Historical Study of the Attributive Form of Verbs and Adjectives in Old Japanese
- 2006 - 2008 Research on the Establishment of Modern Japanese Linguistics : An Analysis on the Research Materials of Yoshiharu Kobayashi
- 2004 - 2005 中古語における叙法体系の研究
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